Simulation of transmitted spectrum in metallic photonic crystals by boundary element method

In this study, scattered and transmitted terahertz waves of a given structure consisted of metallic rods were simulated using the boundary element method (BEM). Through the proposed model, the transmission spectrum of metallic photonic crystals was calculated and it has been shown that the rotation of a structure with an anisotropic cavity leads to the shift of the resonance wavelength. In this work, a tunable multi-chromatic filter was designed whose resonance wavelengths were varied at incident angles of 0° and 90°. The effects of rod materials and the number of rods' rows on the position and quality factor of resonance peaks in finite metallic photonic crystals have also been investigated.